Installing and executing shared applications in shared folders

ABSTRACT

Provided are a method, system, and program for installing and executing shared applications in shared folders. A program is installed by a base computer, having a local storage, to a shared folder accessible to multiple client computers over a network. Installing the program adds files for the program to the shared folder and modifies the local device used by the base computer and enables the base computer to run the program by accessing the program files in the shared folder. An image is created of the local device of the base computer including the installed program. The image is provided to the client computers to apply to local devices of the client computers. Applying the image to the local devices of the client computers enables the client computers to access the program files in the shared folder to run the program.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. patent application Ser. No. 10/596,588, entitled “Installing And Executing Shared Applications In Shared Folders,” filed on Jun. 16, 2006, and published under publication no. US 2008/0256532 A1, which is hereby incorporated by reference in its entirety. U.S. patent application Ser. No. 10/596,588 is a national phase filing, based on international application no. PCT/CN/2005/002231, filed on Dec. 17, 2005.

TECHNICAL FIELD

The subject matter herein relates to data processing and, more particularly, to technology for enabling data processing systems to execute applications residing at least partially on remote storage devices.

BACKGROUND

In certain network environments, such as Internet cafes, corporate settings, etc., all client systems are required to be loaded with an identical set of system programs (e.g., operating system and drivers) and software applications to provide a uniform environment for all the client computers. System provisioning is the process of installing the identical set of system and application programs on all the client computers to implement the uniform environment. System provisioning may be accomplished by first installing system components (e.g., the operating system, drivers, etc.) and the necessary applications onto a “golden computer”. An image may then be taken of the golden computer storage having the installed programs. The identical image from the golden computer may then be loaded onto the local storage devices of the client computers as part of the system provisioning. The copending and commonly assigned patent application titled “Apparatus and Method For Incremental Package Deployment, having U.S. application Ser. No. 11/027,870 and filed Dec. 29, 2004, provides a technique for providing an installation of additional applications on the golden computer to the client computers in an incremental package.

One issue in implementing a uniform computing environment is the ever increasing size of application programs, which requires that the client computers provide sufficient storage space to store such large programs. Certain uniform environments, such as Internet cafes where users are provided access to numerous large computer video game programs and organizations that require access to many large business application programs, require that each client computer includes a substantial amount of storage to store the numerous large applications. Adding sufficient storage space to each of the client computers in such a uniform environment can be costly and substantially raise the cost per client machine and the cost to service the client storage devices.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an embodiment of a network computing environment.

FIG. 2 illustrates an embodiment of components in a memory to access components of shared applications in a shared folder.

FIG. 3 illustrates an embodiment of how the shared folder directory file structure may map to a local directory file structure.

FIG. 4 illustrates an embodiment of operations to deploy an image of a base (golden) computer to client computers in a network.

FIG. 5 illustrates an embodiment of operations to deploy additional incremental installations to a base (golden) computer to client computers in a network.

FIG. 6 illustrates an embodiment of a diagram of how incremental installations to the base computer are deployed to the client computers.

FIG. 7 illustrates an embodiment of components used to create and deploy the base image and incremental packages.

FIG. 8 illustrates an embodiment of operations to write to files in the shared folders.

FIG. 9 illustrates an embodiment of how a file is divided into segments.

FIG. 10 illustrates an embodiment of operations to read files in the shared folders.

FIG. 11 illustrates an embodiment of a computer architecture that may be used with the described embodiments.

DETAILED DESCRIPTION

FIG. 1 illustrates an embodiment of a network computing environment. A base computer 2, also known as the golden computer, includes a processor 4, such as a central processing unit, and a memory 6, such as a volatile memory device used as the system 2 main memory. The base computer 2 has installed core programs 8, such as an operating system and device drivers, etc., and local shared application components 10 for shared application programs 12 installed in a shared folder 14. During initialization, the core programs 8 may be loaded from the local storage 16 into the memory 6 and executed by the processor 4.

The local shared application components 10 comprise those files and configuration settings installed at the base computer 2 when the base computer 2 is used to install the shared applications 12 onto the shared folder 14. Local shared application components 10 installed at the base computer 2 may include library files, system files required when executing the shared applications 12, and configuration settings, such as registry file entries for the shared applications 12. During installation at the base computer 2 of shared applications 12 in the shared folder 14, most of the program files for the shared applications 12 may be stored in the shared folder 14, requiring only a much smaller set of local shared application components 10 to be installed and stored at the base computer 2.

A shared storage 18 is accessible to the base computer 2 and other client computers 20 a . . . 20 n over a network 22. The shared storage 18 includes folders 14 having shared applications 12 installed by the base computer 2. The client computers 20 a . . . 20 n include a processor 22 a . . . 22 n, memory 24 a . . . 24 n, and local storage 26 a . . . 26 n, such as a hard disk drive or other storage devices. At some point, a base image 28 may be formed from all the files installed on the base computer 2, including the core programs 8 and files and settings 10. This base image 28 may be supplied to a server 30 over the network 22, and then deployed by a deployment program 32 executing in the server 30 as base images 28 a . . . 28 n to the client computers 20 a . . . 20 n to install at the client computers 20 a . . . 20 n. The deployment program 32 may also deploy incremental packages of updates to the base image 28 to the client computers 20 a . . . 20 n.

The base 2 and client 20 a . . . 20 n computers may be of a same type or configuration and deployed in an Internet café where the client computers 20 a . . . 20 n are used to run computer games and other programs installed as shared applications 12 in the shared folder 14. The base 2 and client 20 a . . . 20 n computers may exist in other network environments where similar client systems use a same set of application programs, such as a corporate environment or other organizational setting requiring a uniform computing environment.

The base 2 and client 20 a . . . 20 n computers may comprise computing devices known in the art, such as desktop computers, laptops, servers, hand held computing devices, telephony devices, etc. The server 30 may comprise a server class machine. The network 22 may comprise a Local Area Network (LAN), Intranet, the Internet, Wide Area Network (WAN), peer-to-peer network, wireless network, etc. The shared storage 18 may comprise a suitable type of storage device or devices to store the shared applications 12 that may be accessed over the network 22, such as one or more hard disk drives (e.g. an array of disks, such as a Redundant Array of Independent Disks (RAID)), flash memory, etc. In one embodiment, the server 30 may include a storage controller to manage access to the shared storage 18 or the shared storage 18 may comprise hard disk drives within the server 30.

FIG. 2 illustrates an embodiment of certain of the core programs 8 loaded into the memories 6, 24 a . . . 24 n and used to manage read/write requests to shared application 12 components in the shared folders 14. An application 50 executing in a user mode portion of the memory 52, which may comprise the executable files for a shared application 12 accessed from the shared folders 14, may issue a read/write request directed to a file in the shared folder 14. The read/write request toward a shared file 54 in the shared folder 14 is first processed by a remote disk sharing driver 56 executing in a kernel mode 58. The remote disk sharing driver 56 may call a local file system driver 62 to execute the request against a local copy 60 of the requested shared file. If there is no local copy 60 of the requested shared file, then the remote disk sharing driver 56 calls a network file system driver 64 to access the requested shared file 54 from the shared folder 14 to then store as a local copy 60 in a local device, such as a hard disk drive 16, 26 a . . . 26 n or a local memory 6, 24 a . . . 24 n. The remote disk sharing driver 56 maintains a mapping 66 of shared files to local copies 58 of the shared files maintained in the local device. The drivers 56, 62, and 64 may be part of the core programs 8 included in the base computer images 28 a . . . 28 n deployed at the client computers 20 a . . . 20 n.

FIG. 3 illustrates an embodiment of the mapping 66 generated and used by the remote disk sharing driver 56 providing an association of shared files 54 having a local copy 60 in the local device. Shared file directory 70 comprises the file directory structure of the shared folders 14 in the shared storage 18. The local file directory 72 structure indicates the directory structure being generated by the remote disk sharing driver 56 in the local device as files are accessed from the shared storage 54 to provide locally as needed by executing applications 50. Thus, the remote disk sharing driver 56 may generate both the directory structure and files, because a file may be identified by its path as well as file name. The local file directory 72 is only a partial view of the shared file directory 70 if the remote disk sharing driver 56 has not accessed all shared files in the shared folders 14. The mapping 66 provides information 74 associating a shared file 76 with a local copy of the shared file 78. Thus, the mapping may comprises any suitable type of information, data structure, pointer, etc. indicating an association of one shared file with a local copy of the shared file. If there is no mapping information for one shared file 78, then a local copy 78 has not yet been created for the shared file 78.

FIG. 4 illustrates an embodiment of operations performed at the base computer 2 and server 30 to install base images 28 a . . . 28 n on the client computers 20 a . . . 20 n. Upon beginning (at block 100) the process, an administrator installs (at block 102) an operating system, drivers and other core programs 8 on the base computer 2 that are not already installed. After the base computer 2 has the desired base installation, including core programs 8 and local shared application components 10, the administrator may mount (at block 104) the shared folder 14 with writing privileges, if it has not already been mounted, and then install (at block 106) shared application 12 programs on shared folders 18 from the base computer 2. This installation adds program files to the shared folders 18, such as the executable files and other related files and adds the local shared application components 10 (e.g., library files, system files, configuration settings, etc.) to the base computer 16. After the programs are installed, the administrator or a program, such as the deployment program 32, may apply (at block 108) a read-only setting to shared folders 14. An image 28 of the local storage 16 of the base computer 2 including the installed core programs 8 and local shared application components 10 is created (at block 110). The base image 28 is sent (at block 112) to the server 30, where the deployment program 32 deploys (at block 114) the base image 28 to the client computers 20 a . . . 20 n to load into local storage 26 a . . . 26 n and use as base images 28 a . . . 28 n.

FIG. 5 illustrates an embodiment of operations to deploy applications installed in the shared folders 14 from the base computer 12 after the initial installation, such as application programs added at a later point as part of an upgrade. FIG. 6 illustrates the effect of the operations of FIG. 5 in the base 2 and client 20 a . . . 20 n computers. With respect to FIG. 5, upon initiating (at block 130) operations to install new application in the shared folder 14 from the base computer 2, an administrator disables (at block 132) client computers 20 a . . . 20 n access to the shared folders 14. The administrator then installs (at block 134) one or more additional program(s) or program upgrades on the shared folder 14 using the base computer 2. The base computer 2 includes a specialized disk driver 150 (FIG. 6) to redirect write requests during the installation to destination blocks 152 to redirection blocks 154, and indicate in the mapping table 156 those destination blocks 152 whose write data is stored in the redirection blocks 154. Upon intercepting (at block 136) writes to base computer destination blocks 152 in memory 6, the disk driver 150 creates (at block 138) an entry in the mapping table 156 associating the destination blocks 152 to which the write is directed to redirected blocks 154 if there is no preexisting entry for the target destination blocks 152. The writes are then applied (at block 140) to the redirected blocks 154. If (at block 142) installation has not completed, then control returns to block 136 to process further writes. Otherwise, if installation has completed, then an incremental package 158 is formed (at block 144) including copies 154′ and 156′ of the redirected blocks 154 and mapping table 156, respectively, having writes made to the base computer memory 6 during the application upgrade installation. The incremental package 158 is supplied to the server deployment program 32 which then deploys (at block 146) the incremental package 158 to the client computers 20 a . . . 20 n to commit (at block 148) the redirected blocks 154 a . . . 154 n loaded into the client memories 24 a . . . 24 n to the destination blocks 152 a . . . 152 n in the client memories 24 a . . . 24 n using the mapping tables 156 a . . . 156 n. Instances 158 a . . . 158 n of incremental package 158 are supplied to the client computers 20 a . . . 20 n, each instance 158 a . . . 158 n including redirected blocks 154 a . . . 154 n and the mapping tables 156 a . . . 156 n. At some point, the writes from the update to the base computer 2 are then moved from the destination blocks 152 a . . . 152 n in the memories 24 a . . . 24 n to the non-volatile copy in local storage 26 a . . . 26 n.

With the embodiments of FIGS. 4, 5, and 6, an administrator may first install application and system programs on the base (golden) 2 to perfect and test the installation. An image of the entire base (golden) computer 2 may then be provided to load onto the client computer local storages 26 a . . . 26 n. Further, an incremental package 158 of application related components added, e.g., libraries, etc., added to the base computer 2 during an upgrade to the shared applications 12 may be provided to the client computers 20 a . . . 20 n to load. In this way, most of the shared application 12 components and files are maintained in the shared folders 14, and only certain application components 10, e.g., registry entries, system files, are added to the client computers 20 a . . . 20 n to use to access and run the shared applications 12. This conserves the amount of space used by the local storage 26 a . . . 26 n.

FIG. 7 illustrates an embodiment of components implemented in the base computer 2 and or server 30 to perform the image creation and deployment operations of FIGS. 4, 5, and 6. The base computer 2 is provided one or more installation programs 170 that run on the base computer 2 and are installed on the base computer and/or shared folders 14. The installation program 170 may perform the operations at blocks 102, 104, and 106 of FIG. 4. An image program 174, which may execute on the base computer 2 or the server 30, creates an image of the contents of the local storage 16, or base image 28 (FIG. 1). The image program 174 may perform the operation at blocks 110 and 112 in FIG. 4. A deployment program 180 that runs on the server 30, or alternatively on the base computer 2, may deploy the base image 2 to the client computers 20 a . . . 20 n as base images 28 a . . . 28 n. An incremental package program 176 may comprise the disk driver 150 (FIG. 6) to perform the operations of FIG. 5, e.g., operations 152, 154, 156, 158, 160, 162, and 165, to create an incremental package 158 including redirected blocks 154′ and mapping table 156′. The incremental package deployment program 180 may deploy the incremental package 158 to the client computers 20 a . . . 20 n by performing the operations at block 166 in FIG. 5.

FIG. 8 illustrates an embodiment of operations performed by the remote disk sharing driver 56 during operations the client computers 20 a . . . 20 n perform to write data to the files for the shared applications 12 in the shared folders 14. The remote disk sharing driver 56 intercepts (at block 200) a write request from an executing application 50 to a requested shared file in the shared folder 14. The remote disk sharing driver 56 determines (at block 202) whether the mapping 66 provides a mapping of the requested shared file 54 (FIG. 2) to a local copy 60 of the shared file. If so, then the remote disk sharing driver 56 writes (at block 204) the update to the local copy 60 of the shared file, updating segment(s) including the modified data. FIG. 9 shows that a local copy of a file 230 in the memory 24 a . . . 24 n is comprised of a plurality of segments 232 a . . . 232 n and includes file metadata 234, such as the number of segments 232 a . . . 232 n, the number of empty segments and/or segments including data. If (at block 202) there is no local copy 60, then the remote disk sharing driver 56 generates (at block 206) a mapping 74 (FIG. 3) in the mapping 66 of the shared file to a local copy 60 of the shared file. Control then proceeds to block 204 to write the write data to one or more segments 232 a . . . 232 n in the local copy of the shared file 60.

With the embodiments of FIGS. 8 and 9, the client computers 20 a . . . 20 n do not alter the contents of the shared folders 14 because all writes to segments of the application 12 components and files in the shared folders 14 are stored and maintained locally. This avoids any write conflicts to the shared folder 14 when the clients are executing shared applications 12 from the shared folders 14.

FIG. 10 illustrates operations performed by the remote disk sharing driver 56 during operations the client computers 20 a . . . 20 n perform to read data from the files for the shared applications 12 in the shared folders 14. Upon intercepting (at block 250) a read request to a requested shared file in the shared folder 14, the remote disk sharing driver 56 determines (at block 252) whether the mapping 66 includes a mapping of the shared file 54 to a local copy 60 of the shared file. If so, then a determination is made (at block 254) whether the local copy 60 of the requested shared file includes the segment(s) 232 a . . . 232 n having the requested data. If (at block 254) the requested segments are not in a local device, e.g., storage 26 a . . . 26 n or memory 24 a . . . 24 n, then the remote disk sharing driver 56 accesses (at block 256) the at least one segment 232 a . . . 232 n including the requested data from the requested shared file 230 in the shared folder 14 over the network 22 and stores (at block 258) the accessed segment 232 a . . . 232 n in the local copy 60 of the shared file. If there is already data for the accessed segment 232 a . . . 232 n at the local device, then the requested data accessed from the shared folder may be combined with the data already in the accessed segment 232 a . . . 232 n.

If (at block 254) the requested segments 232 a . . . 232 n are in the local device, then data for the read request is accessed (at block 260) from the local copy 60. From block 258 or 260, control proceeds to block 262 to return the accessed data to the read request. If (at block 252) there is no mapping 74 (FIG. 3) in the mappings 66 of the requested shared file to a local copy 60, then the remote disk sharing driver 56 generates (at block 264) a mapping 74 (FIG. 3) of the requested shared file 54 to a local copy 60 of the requested shared file in the local device (e.g., memory 24 a . . . 24 n or storage 26 a . . . 26 n). Control then proceeds to block 256 to access the data locally to return.

In further embodiments, the remote disk sharing driver 56 may limit the number of shared files stored locally by deleting local copies 60 on a Last-in-First-Out (LIFO) or least frequently used basis.

With the operations of FIG. 10, segments of shared files 54 in the shared folder 14 are accessed over the network 22 as needed and stored locally to return to read requests. The segments accessed from the shared folders 14 may comprise components of shared applications 12, such as executable files and files used by the executable file, e.g., dynamic linked libraries, images, video, etc. Further, because the client computers 20 a . . . 20 n only have read access to the shared folders 14 and maintain writes to components of shared application 12 in a local device (e.g., memory 24 a . . . 24 n or storage 26 a . . . 26 n) the risk of a conflicting write operation to the shared folders 14 delaying a client's access of a file is substantially reduced. Further, maintaining segments of shared components locally allows for faster local access to those portions of the shared applications 12 accessed frequently. Yet further, downloading components only as needed conserves storage space at the local storage 26 a . . . 26 n, while at the same time providing access to many shared applications 12 whose direct installation on the client computers 20 a . . . 20 n would require additional storage space at the client computers.

The described operations may be implemented as a method, apparatus or article of manufacture using standard programming and/or engineering techniques to produce software, firmware, hardware, or any combination thereof. The described operations may be implemented as code maintained in a “computer readable medium”, where a processor may read and execute the code from the computer readable medium. A computer readable medium may comprise media such as magnetic storage medium (e.g., hard disk drives, floppy disks, tape, etc.), optical storage (CD-ROMs, DVDs, optical disks, etc.), volatile and non-volatile memory devices (e.g., EEPROMs, ROMs, PROMs, RAMs, DRAMs, SRAMs, Flash Memory, firmware, programmable logic, etc.), etc. The code implementing the described operations may further be implemented in hardware logic (e.g., an integrated circuit chip, Programmable Gate Array (PGA), Application Specific Integrated Circuit (ASIC), etc.). Still further, the code implementing the described operations may be implemented in “transmission signals”, where transmission signals may propagate through space or through a transmission media, such as an optical fiber, copper wire, etc. The transmission signals in which the code or logic is encoded may further comprise a wireless signal, satellite transmission, radio waves, infrared signals, Bluetooth, etc. The transmission signals in which the code or logic is encoded is capable of being transmitted by a transmitting station and received by a receiving station, where the code or logic encoded in the transmission signal may be decoded and stored in hardware or a computer readable medium at the receiving and transmitting stations or devices. An “article of manufacture” comprises computer readable medium, hardware logic, and/or transmission signals in which code may be implemented. A device in which the code implementing the described embodiments of operations is encoded may comprise a computer readable medium or hardware logic. Of course, those skilled in the art will recognize that many modifications may be made to this configuration without departing from the scope of the present invention, and that the article of manufacture may comprise suitable information bearing medium known in the art.

FIG. 11 illustrates an embodiment of a computer architecture 300 that may be implemented at the base 2 and client 20 a . . . 20 n computers. The architecture 300 may include a processor 302 (e.g., a microprocessor), a memory 304 (e.g., a volatile memory device), and storage 306 (e.g., a non-volatile storage, such as magnetic disk drives, optical disk drives, a tape drive, etc.). The storage 306 may comprise an internal storage device or an attached or network accessible storage. Programs, including an operating system 308 and application programs, in the storage 306 are loaded into the memory 304 and executed by the processor 302 in a manner known in the art. The architecture further includes a network card 310 to enable communication with a network. An input device 312 is used to provide user input to the processor 302, and may include a keyboard, mouse, pen-stylus, microphone, touch sensitive display screen, or any other activation or input mechanism known in the art. An output device 314 is capable of rendering information transmitted from the processor 302, or other component, such as a display monitor, printer, storage, etc.

The terms “an embodiment”, “embodiment”, “embodiments”, “the embodiment”, “the embodiments”, “one or more embodiments”, “some embodiments”, and “one embodiment” mean “one or more (but not all) embodiments of the present invention(s)” unless expressly specified otherwise.

The terms “including”, “comprising”, “having” and variations thereof mean “including but not limited to”, unless expressly specified otherwise.

The enumerated listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise.

The variable “n” when used to represent a variable number of an element, e.g., 20 a . . . 20 n, 232 a . . . 32 n, etc., may indicate any number of instances of the element, and may indicate different integer numbers when used with different elements or with the same element in different instances.

The terms “a”, “an” and “the” mean “one or more”, unless expressly specified otherwise.

Devices that are in communication with each other need not be in continuous communication with each other, unless expressly specified otherwise. In addition, devices that are in communication with each other may communicate directly or indirectly through one or more intermediaries.

A description of an embodiment with several components in communication with each other does not imply that all such components are required. On the contrary a variety of optional components are described to illustrate the wide variety of possible embodiments of the present invention.

Further, although process steps, method steps, algorithms or the like may be described in a sequential order, such processes, methods and algorithms may be configured to work in alternate orders. In other words, any sequence or order of steps that may be described does not necessarily indicate a requirement that the steps be performed in that order. The steps of processes described herein may be performed in any order practical. Further, some steps may be performed simultaneously.

When a single device or article is described herein, it will be readily apparent that more than one device/article (whether or not they cooperate) may be used in place of a single device/article. Similarly, where more than one device or article is described herein (whether or not they cooperate), it will be readily apparent that a single device/article may be used in place of the more than one device or article or that a different number of devices may be used than the multiple number shown.

The functionality and/or the features of a device may be alternatively embodied by one or more other devices which are not explicitly described as having such functionality/features. Thus, other embodiments of the present invention need not include the device itself.

The illustrated operations of FIGS. 4, 5, 8, and 10 show certain events occurring in a certain order. In alternative embodiments, certain operations may be performed in a different order, modified or removed. Moreover, steps may be added to the above described logic and still conform to the described embodiments. Further, operations described herein may occur sequentially or certain operations may be processed in parallel. Yet further, operations may be performed by a single processing unit or by distributed processing units.

The foregoing description of various embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto. The above specification, examples and data provide a complete description of the manufacture and use of the composition of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended. 

1. A method comprising: installing an application onto a first computer that has a local storage device and that has access to a remote storage device, wherein the operation of installing the application comprises: writing a first portion of the application to a first local file on the local storage device; and causing a second portion of the application to be written to a remote file on the remote storage device; creating a base installation image to allow at least one second computer to execute the application, wherein the base installation image comprises data from the first local file of the first computer, and wherein (a) the base installation image, when copied to a local storage device of the second computer, and (b) the remote file, enable the second computer to execute the application; installing an update for the application onto the first computer, wherein the operation of installing the update for the application causes the first computer to write a second local file to the local storage device of the first computer; and creating an incremental update image to allow at least the second computer to execute the updated application, wherein the incremental update image comprises at least part of the second local file from the first computer, and wherein (a) the incremental update image, when applied to the local storage device of the second computer, and (b) the remote file, enable the second computer to execute the updated application.
 2. A method according to claim 1, wherein the operation of installing the update for the application onto the first computer further comprises: causing an updated version of the remote file to be written to the remote storage device, the updated version of the remote file to be available to the second computer to enable the second computer to execute the updated application.
 3. A method according to claim 1, wherein: the second local file comprises a substitute file to serve as a local copy of at least part of the remote file on the remote storage device; and the operation of installing an update for the application onto the first computer comprises: while the application is being installed, redirecting write requests directed to the remote file on the remote storage device, so that said write requests are applied to the substitute file on the local storage device instead of being applied to the remote storage device.
 4. A method according to claim 1, further comprising: before installing the application onto the first data processing system, mounting a shared folder in the remote storage device to the first data processing system; and directing the first data processing system to install the application into the shared folder.
 5. A method according to claim 4, wherein: the remote file comprises a shared file in the shared folder on the remote storage device; the second local file comprises a substitute file to serve as a local copy of at least part of the shared file on the remote storage device; and the operation of installing an update for the application onto the first computer comprises: while the application is being installed, redirecting write requests directed to the shared file on the remote storage device, so that said write requests are applied to the substitute file on the local storage device instead of being applied to the remote storage device.
 6. A method according to claim 1, wherein: the first computer comprises a master computer; and the method further comprises enabling multiple client computers that have access to the remote storage device to execute the application by copying the base installation image to the multiple client computers.
 7. A method according to claim 6, wherein the method further comprises: after copying the base installation image to the multiple client computers, enabling the multiple client computers to execute the updated application by copying the incremental update image to the multiple client computers.
 8. A method comprising: copying a base installation image to a first local file in a local storage device of a client computer, wherein the base installation image comprises data that was written to a local storage device of a master computer during installation of an application onto the master computer while the master computer had access to a remote storage device; executing the application from the client computer, using (a) the local file and (b) a remote file that was written to the remote storage device during installation of the application by the master computer; creating a second local file on the local storage device of the client computer, based on an incremental update image from the master computer, wherein the incremental update image comprises data that was written to the local storage device of the master computer during installation of an update for the application by the master computer; and executing the updated application from the client computer, using (a) the second local file and (b) data from the remote file.
 9. A method according to claim 8, wherein the operation of executing the updated application from the client computer comprises: using an updated copy of the remote file to execute the updated application, wherein the updated copy of the remote file comprises at least one change that was made to the remote file during installation of the update by the master computer.
 10. A method according to claim 8, wherein: the second local file comprises a substitute file to serve as a local copy of at least part of the remote file on the remote storage device; and the operation of executing the updated application from the client computer comprises: redirecting at least some of the read requests directed to the remote file on the remote storage device, so that said redirected read requests are satisfied from the substitute file on the local storage device instead of being satisfied from the remote storage device.
 11. An article comprising: a tangible machine accessible medium; and instructions in the machine accessible medium which, when executed by a first computer that has a local storage device and that has access to a remote storage device, enable the first computer to perform operations comprising: installing an application onto the first computer, wherein the operation of installing the application comprises: writing a first portion of the application to a first local file on the local storage device; and causing a second portion of the application to be written to a remote file on the remote storage device; creating a base installation image to allow at least one second computer to execute the application, wherein the base installation image comprises data from the first local file of the first computer, and wherein (a) the base installation image, when copied to a local storage device of the second computer, and (b) the remote file, enable the second computer to execute the application; installing an update for the application onto the first computer, wherein the operation of installing the update for the application causes the first computer to write a second local file to the local storage device of the first computer; and creating an incremental update image to allow at least the second computer to execute the updated application, wherein the incremental update image comprises at least part of the second local file from the first computer, and wherein (a) the incremental update image, when applied to the local storage device of the second computer, and (b) the remote file, enable the second computer to execute the updated application.
 12. An article according to claim 11, wherein the operation of installing the update for the application onto the first computer further comprises: causing an updated version of the remote file to be written to the remote storage device, the updated version of the remote file to be available to the second computer to enable the second computer to execute the updated application.
 13. An article according to claim 11, wherein: the second local file comprises a substitute file to serve as a local copy of at least part of the remote file on the remote storage device; and the operation of installing an update for the application onto the first computer comprises: while the application is being installed, redirecting write requests directed to the remote file on the remote storage device, so that said write requests are applied to the substitute file on the local storage device instead of being applied to the remote storage device.
 14. An article according to claim 11, wherein: the remote file comprises a shared file in a shared folder on the remote storage device; the second local file comprises a substitute file to serve as a local copy of at least part of the shared file on the remote storage device; and the operation of installing an update for the application onto the first computer comprises: while the application is being installed, redirecting write requests directed to the shared file on the remote storage device, so that said write requests are applied to the substitute file on the local storage device instead of being applied to the remote storage device.
 15. An article comprising: a tangible machine accessible medium; and instructions in the machine accessible medium which, when executed by a client computer that has a local storage device and that has access to a remote storage device, enable the client computer to perform operations comprising: copying a base installation image to a first local file in the local storage device of the client computer, wherein the base installation image comprises data that was written to a local storage device of a master computer during installation of an application onto the master computer while the master computer had access to the remote storage device; executing the application from the client computer, using (a) the local file and (b) a remote file that was written to the remote storage device during installation of the application by the master computer; creating a second local file on the local storage device of the client computer, based on an incremental update image from the master computer, wherein the incremental update image comprises data that was written to the local storage device of the master computer during installation of an update for the application by the master computer; and executing the updated application from the client computer, using (a) the second local file and (b) data from the remote file.
 16. An article according to claim 15, wherein the operation of executing the updated application from the client computer comprises: using an updated copy of the remote file to execute the updated application, wherein the updated copy of the remote file comprises at least one change that was made to the remote file during installation of the update by the master computer.
 17. An article according to claim 15, wherein: the second local file comprises a substitute file to serve as a local copy of at least part of the remote file on the remote storage device; and the operation of executing the updated application from the client computer comprises: redirecting at least some of the read requests directed to the remote file on the remote storage device, so that said redirected read requests are satisfied from the substitute file on the local storage device instead of being satisfied from the remote storage device.
 18. A data processing system comprising: a processor; at least one local storage device responsive to the processor; and instructions in the local storage device which, when executed by the data processing system, enable the data processing system to perform operations comprising: copying a base installation image to a first local file in the local storage device of the data processing system, wherein the base installation image comprises data that was written to a local storage device of a master computer during installation of an application onto the master computer while the master computer had access to a remote storage device; executing the application from the client computer, using (a) the local file and (b) a remote file that was written to the remote storage device during installation of the application by the master computer; creating a second local file on the local storage device of the data processing system, based on an incremental update image from the master computer, wherein the incremental update image comprises data that was written to the local storage device of the master computer during installation of an update for the application by the master computer; and executing the updated application from the data processing system, using (a) the second local file and (b) data from the remote file.
 19. A data processing system according to claim 18, wherein the operation of executing the updated application from the data processing system comprises: using an updated copy of the remote file to execute the updated application, wherein the updated copy of the remote file comprises at least one change that was made to the remote file during installation of the update by the master computer.
 20. A data processing system according to claim 18, wherein: the second local file comprises a substitute file to serve as a local copy of at least part of the remote file on the remote storage device; and the operation of executing the updated application from the data processing system comprises: redirecting at least some of the read requests directed to the remote file on the remote storage device, so that said redirected read requests are satisfied from the substitute file on the local storage device instead of being satisfied from the remote storage device. 